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Derivatives and Risk Management Activities - Assets and Liabilities (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Derivative assets and liabilities
Asset Derivatives Fair Value	$ 485		$ 480
Liability Derivatives Fair Value	(176)		(262)
Net loss deferred in AOCI	198
Net loss expected to be reclassified to earnings in the next twelve months	8
Other current assets
Derivative assets and liabilities
Asset Derivatives Fair Value	450		443
Liability Derivatives Fair Value	(121)		(182)
Other long-term assets, net
Derivative assets and liabilities
Asset Derivatives Fair Value	31		34
Liability Derivatives Fair Value	(3)		(7)
Other current liabilities
Derivative assets and liabilities
Asset Derivatives Fair Value	1
Liability Derivatives Fair Value	(15)		(20)
Other long-term liabilities and deferred credits
Derivative assets and liabilities
Asset Derivatives Fair Value	3		3
Liability Derivatives Fair Value	(37)		(53)
Interest Rate Derivatives
Derivative assets and liabilities
Net unrealized gain/(loss) recognized in net income	(23)	$ 31
Derivatives in Hedging Relationships | Interest Rate Derivatives
Derivative assets and liabilities
Asset Derivatives Fair Value			2
Liability Derivatives Fair Value	(30)		(9)
Derivatives in Hedging Relationships | Interest Rate Derivatives | Other current assets
Derivative assets and liabilities
Asset Derivatives Fair Value			2
Derivatives in Hedging Relationships | Interest Rate Derivatives | Other current liabilities
Derivative assets and liabilities
Liability Derivatives Fair Value	(11)		(1)
Derivatives in Hedging Relationships | Interest Rate Derivatives | Other long-term liabilities and deferred credits
Derivative assets and liabilities
Liability Derivatives Fair Value	(19)		(8)
Derivatives Not Designated as a Hedge
Derivative assets and liabilities
Asset Derivatives Fair Value	485		478
Liability Derivatives Fair Value	(146)		(253)
Derivatives Not Designated as a Hedge | Other current assets
Derivative assets and liabilities
Asset Derivatives Fair Value	450		441
Liability Derivatives Fair Value	(121)		(182)
Derivatives Not Designated as a Hedge | Other long-term assets, net
Derivative assets and liabilities
Asset Derivatives Fair Value	31		34
Liability Derivatives Fair Value	(3)		(7)
Derivatives Not Designated as a Hedge | Other current liabilities
Derivative assets and liabilities
Asset Derivatives Fair Value	1
Liability Derivatives Fair Value	(4)		(19)
Derivatives Not Designated as a Hedge | Other long-term liabilities and deferred credits
Derivative assets and liabilities
Asset Derivatives Fair Value	3		3
Liability Derivatives Fair Value	(18)		(45)
Derivatives Not Designated as a Hedge | Commodity Derivatives
Derivative assets and liabilities
Asset Derivatives Fair Value	485		478
Liability Derivatives Fair Value	(132)		(208)
Derivatives Not Designated as a Hedge | Commodity Derivatives | Other current assets
Derivative assets and liabilities
Asset Derivatives Fair Value	450		441
Liability Derivatives Fair Value	(121)		(182)
Derivatives Not Designated as a Hedge | Commodity Derivatives | Other long-term assets, net
Derivative assets and liabilities
Asset Derivatives Fair Value	31		34
Liability Derivatives Fair Value	(3)		(7)
Derivatives Not Designated as a Hedge | Commodity Derivatives | Other current liabilities
Derivative assets and liabilities
Asset Derivatives Fair Value	1
Liability Derivatives Fair Value	(3)		(10)
Derivatives Not Designated as a Hedge | Commodity Derivatives | Other long-term liabilities and deferred credits
Derivative assets and liabilities
Asset Derivatives Fair Value	3		3
Liability Derivatives Fair Value	(5)		(9)
Derivatives Not Designated as a Hedge | Foreign Currency Derivatives
Derivative assets and liabilities
Liability Derivatives Fair Value	(1)		(9)
Derivatives Not Designated as a Hedge | Foreign Currency Derivatives | Other current liabilities
Derivative assets and liabilities
Liability Derivatives Fair Value	(1)		(9)
Derivatives Not Designated as a Hedge | Preferred Distribution Rate Reset Option
Derivative assets and liabilities
Liability Derivatives Fair Value	(13)		(36)
Derivatives Not Designated as a Hedge | Preferred Distribution Rate Reset Option | Other long-term liabilities and deferred credits
Derivative assets and liabilities
Liability Derivatives Fair Value	$ (13)		$ (36)

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- Definition

Accumulated change, net of tax, in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses.

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